Grinding or pulverizing mill.



PATENTED FEB. 26, 1907.

S. OSBORNE. GRINDING 0R PULVERIZING MILL A?PLIUATION FILEDSB1"J..17,19044 -3 SHEETS-SHEET 1.

w. m.. n. B

Nb. 845,661. PATENT@ PEB. 26, 1907.

W. s. OSBORNE. GRINDING 0R PULVERIZING MILL.

v.APPLIATION FILED SEPT. 17,1904.

3 SHEETS-SHEET 2 ...4.... g QM.

PATENTBD FEB. 26, 1907.

W. S. GSBORNE. GRINDING 0R PULVERIZING MILL.

APPLICATION FILED SEPT. 17, 1904.

3 SHEETS-SHEET 3.

atkozne? @www wh/wah: y

ITED STATES PATENT oEEIoE.

WILLIAM s; oSBoRNE, or MARIETTA, PENNSYLVANIA.

GRINDING OR, PULVEBIZING MILL.

crushing or pulverizing mills in which thexv material is fed between arevolving ring and crushing-rolls working within said ring. The objectsof my invention are to provide `a mill Ain which the material isfedvbetween crushing-rolls and crushing-rings and to provide, inconnection with said crushing devices, a rotary sifting device which isso arranged that the 'material which is too,` coarse to pass through thesieves is elevated by the rotation of the sieves, so as to be again fedbetween the crushing-surfaces.

In the preferred'embodiment of my invention there are three rolls ofdifferent sizes on a driving-shaft, which rolls impart movement to thecrushing-rings, and these rings in turn impart motion to spring--actuated crushing-rolls which are held against said rings in grindingcontact therewith. As the material is fed to these rolls it ispulverized and passes out from the grinding-chamber onto a rotary sieve,and that part of the materil which is sufiiciently pulverized passesthrough the screen to be delivered to any proper receptacle or vehicle.The coarser material is delivered over the edges of the A screens intorotary pockets forming part of the rotary screensf and as the screensand` pockets' are rotated this coarser material is rough-t up to a pointwhere it may fall through hoppers and again delivered betweenthecrushing-rolls and the crushingrings. A

Myin'vention therefore consists in the pulverizing-mill which is shownin its preferable embodiment in the accompanying drawings,

definitely claimed.

In the drawings which accompany and form part of this application,Figure 1 is averticalv central section through my entire mill. "Fig, 2is an end elevation of the same with parts broken away in order tobetter illustrate the construction.. Fig. 3 is a vertical section withparts broken away in order Specification of v Letters Patent.

17.1904. Serial No. 224.870.

` posite sides of the machine, each being Patented Feb. 26, 1907.

` to show the pockets provided by apparatus su ported by a pair ofstandards 3 and 4. 'Ifie main castings 1 and 2 are formed with bearings6 and 7 for lthe main or driving shaftiS, which is driven by balancedpulleys 9 and 10 from any suitable source or power. The main castings 1and-2 are of peculiar formation-in that each one of them is formed,` asshown in I* ig. 2, with a hollow end portion, in eachA of which issupported bearings for supplemental-shafts, w ich will be hereinaftermore particularly described.

castings 1 and 2 is secured plates 14 and 15, which form the walls ofthe grinding-chamber. These plates 14 and 15 are preferably bolted tothe main castings 1 and 2- and are provided with hubs 17 and 18, whichform additional bearings for the main shaft 8. To

these plates 14 and 15 are secured cylin-' drical casings 20 and 21, andto these casings issecnred the exterior frame, whichy com-V rises theouter lplates 24 and 25, connected by the curved sheets 27, 28, 29, and30, which are bolted or riveted together, as clearly seenl 36, and 37supports an independent grinding-rirg, these rings being designated bythe numerals 40, 41, and 42. These three rings are supported bytheaforesaid rolls 35, 36, and '37 and are rotated by said rolls wheneverower is applied'to the pulleys -9 and 10. In addition to supporting therings 40, 41, and 42 the rolls 35, 36, and 37 also act to grind orpulverize any material that is carried up to the rolls by the rings; butin order to more effectively pulverize the material I employ two,othersets of rolls, which I will now describe, together with theirsupportingshafts. As indicated in Fig. 2, there are two supplementalshafts, (designated 44 and 45,)

-To the interi-or surfaces of each ofthe main .nated by the numlerals47and 48. These rollers are not used to drive the rings, but instead aredriven by the iings during the process of grinding or pulverizing, andthey must therefore be held against the rings with considerablepressure. This may be. accomplished in a number of ways, as by springsor weights; but I much prefer the simple way .illustrated in mydrawings, and which consists of the following parts: For each shaft 44and' 45, at opposite ends thereof, I provide movable bearings and 51,which are arranged to fit and slide. within the openings 53 and 54,formed within the main castings and which openings have beenhereinbefore menti'one'd.v Each bearing is provided with a spindle orshank 56, having a head 57, around which spindle or shank a spiralspring 59 is placed, either before or after the hea is se- .cured to thespindle or shank 56.5" Slipped over the spindle or shank 56 is 'a'U-shaped open" member 60, having projecting portions at its'upper endforming a seat for the spring 59. The'. opposite end of said member 60is provided with a shank 61, which projects through an'opening 62 in.the main frame, and on the exposed\end of this spindle or shank isscrewed an adjusting-nut 65, by

' Awhich the tension of the spring may be easily adjusted. The 'shanks56 of these openended members 60 are first slipped through theiropenings 62, and the bearings ,may then be slipped in the open-endedmain frame, the

nut being adjusted alter the parts are assembled. v1t will be understoodthat the bearings 50 and 51 at each end of each lshaft is provided withthe spring-actuated device 'movement is transmitted to th uppersupporting-rolls 35, 36, and 37 andl motion is transmitted from' theserolls so as to rotate the grinding-rings'40, 41, and 42 around the saidrolls. As these rings rotate the grinding-rolls 47 and 48, which areheld by the.,v

springs 59 in contact with'therings.- 40, 41, and 42, are rotated bysaid rings, and as the material to be pulverized' is fed into thegrinding-cylinder it is crushed in its' passage between the-variousrolls and their respective rings. It will thus be seen thatI providethree driving-rolls which support the grinding-rings and that the latterrotate the main grinding-rolls which are held by spring pressure againstthe interior walls of the rings as theyV 'are driven by the latter; andit will grinding-rolls are of differentsizes, the center one being muchthe larger, the speed of rotation given to the three rings 40 and 42 issomewhat slower than that given to the ceniter ring 41. I desire to callparticular attention to these crushing-rolls and to their method lofoperation. In addition to the fact that the two outside sets of rollsare smaller in size and therefore rotate their respective rings at alower speed, because I arrange them in a-series and cause the grindingto be done first by the smaller andafterward by the larger rolls, I amenabled to provide a gradual reduction-mill which gives exceedingly iineresults. By referring again to Fig. 1 of the drawings it will beobserved that there are two retaining-rings 63 4and 64, one of which issecured to the left-hand grindingring 40 and the other to the right-handgrinding-ring 42. It will also be observed that these rings lap over thespace between the outside grinding-rings and their grindingrolls, sothat it is impossible for any material l to pass out between the rollsand their rings at this point.. Hence the material which has been fed bythe delivery-spouts (94 hereinafter referred to) is compelled afterreceiving a preliminary crushing by the outside rolls to pass inwardlytoward the center 'set of rolls. Of course if any material has beencrushed fine enough by the outsiderolls this line material passes out ofthe two spaces 40Et and 41a between the inner ring and the two outsiderings; but the material which has not. been ground fine enoughis forcedbetween the larger center rolls and their rings and is thus ground untilit is fine' enough to 'pass out of the said restricted openings 4l)a and41a. To state the matter ina different way, the object in using rolls ofdifferent diameters is to permit the use of-a middle grinding-ringhaving a grinding-surface of greater dianreter than thegrinding-surfaces-of the side rings,

dle ring may be so located ast'o facilitate the delivery of materialfrom theside rings to the middle ring-that is to say, by thisQnstruction the, grinding-surface of the mi dle rino,r at the lowerportion of the ring is below the grinding-surfaces of the side rings, so

.the middle ring, and also since the rings are carry material from theside rings to the midther from the axis gf the rings than thegrinding-surface of the side rings. dierential movement ofthe adjacentlateral surfaces of the grinding-rings duey to theirdift'erentperipheral speeds, which facilitates the passageof grindingmaterial through the spaces between the rings.

construction described is that the side rings also be observed that,inasmuch as the three.

in order that the grinding-surface of the mid- There is also af Theresult of the- TOO IIO

that material can fall from the side rings to f concentric thecentrifugal action tends to I dle ring about their'entire peripheries,the grinding-surface of the middle ring being farv "when rolled give apreliminary`crushing .which is not as fine as that dueto the larger andmore powerful center rolls. I deem this gradual crushing as ofconsiderable importance. After 4the crushed material passes out of theopeningsr. 41IL itfpasses onto screens that will now be described.

Secured to the outer-plates 24 and 25 of the exterior casing are twobearings, 43 and 46,- and sup orted in these bearings is a shaft 66, towhici'iis secured a'sprocketrwhee'l 67, from whichmotionisreceivedfroma-lsprocketwheel 68`on the main shaft 8 by means of thesprocket-chain 69. Near the ends of' the supplemental shaft' and keyedtlijereto are two gear-Wheels or pinons 70 and-.71, and these gears orpinions mesh with internal gears, forming rings 72 and 73; of circularform. These rings 72 and 73 are supported on the aforesaid pinions 70and 71 and are prevented from lateral motion by means of twoidlers75 and7 6. (Shown in Fig. 2 asbeing supported on bearings 77 and 78.) Theconstruction is such that whenever motion is transmitted from the mainshaft 8 to the supplemental shaft 66 by means of the sprocketwheels 67and 68 and the sprocket-chain 69 the gears .70 and 71 rotate theinternallygeared rings 7.2and 73. To these rings are secured on eachside of the mill side frames 78 ald 79, which support between them theldouble screens or sieves 80 and 81, the two side frames being heldtogether by bolts 82 and 83, as clearly shown in Fig. 1. The side frame78 and 79 `are preferablyjoctagonal in form, as indicated in Fig. 2, andare formed with pockets 84 and 85, which are divided by partitions96, asshown in dotted lines in Fig. 2. The -outer edges of these pockets areclosed by rings 87 and 88,which prevent any f of the material fromescaping between the pockets and the outer plates 24 and 25 of theexterior casing. To these rings 87 and 88 are also secured rings 89 and90, which point inward, so as to deflect the material.' away from theouter plates 24 and 25.. As these rings, with their pockets 84, arerotatedthe coarse material which. has not been pulverized sufficientlypasses out of. the sides of the screens into the said pockets, and asthe pockets rotate the coarse material is carried by the divisionalwalls 96 of the pockets until the pockets reach such a position that thematerialv will fall therefrom by gravity.. In order to catch thematerial as it vfalls and feed it back into the grinding-chamber again,I

employ a pair of hoppers 92 and`93', whichare supported on the shaft 66near the opposite ends thereof, as clearly seen inFig. '1. These.hoppers are of the peculiar shape 'shownin dotted lines in Fig. 2 andare contracted at their lower ends so as`to beformed in delivery-spouts94 immediately over` the right-hand sets of rolls, as viewed in Fig. 2.Hence as the material drops onto the screens y and is sifted thereby anymaterial which is too coarse to pass through the screens passes into thepockets 84 and by them carried to p the upper end of the machine, wherethese coarse particles are dropped into the hoppers 92 and 93 and againdelivered to the grinding-rolls to be reground. It lwill be noticed thatthe inclination of the partitions 96'is such that it. will hold thematerial until the partition is over the upper enlarged yend of thehopper before the material can slide off of the partition-walls. Theuncrushed'mate-- rial is in the first instance f'ed to the hoppers 92and 93 through spouts or chutes 96 and 97 which pass through the outerplates 24 and 25, as seen in Fig. ,1.

- It is believed a fair description of the 'operation of my mill hasbeen given in connection with the detailed description of the various yparts, yet it may be best to vstate that as the material leaves thehoppers 92 .and 93 it falls immediately over both of the outer righthandsets of grinding-rolls, as seen in dotted A lines in Fig. 2, and asthese grinding-rolls rotate .in the direction shown in the arrow in saidfigure the material is givenv a preliminary crushing in its passagebetween the surfaces of said rolls'and the grinding-rings 40, 41, and42. TheA material which is' fine enough to escape passes through theopenings 40a and 41a onto the screens 82 and 83. and is siited therebybut the material which is not fine enough to escape isl carried aroundby the rings 40, 4.1, and 42 (which it will be remembered. revolve atdifferent speeds) and passes between the other larger set ofgrinding-rollers. Of coursev a portion of the material is also carriedby centrifugal force up to the upper set of rolls 35, 36, and 37 and isground between these rolls and the grindingrings. The material whichpasses out of the 'spaces 40a and 41'EL onto the screens issfted and thematerial is delivered out ofthe spout or hopper 33, while thoseportionswhich are too coarse to be sifted pass through the openings at. the endsof the screens into the pockets 8,4 and are carried by the walls 86thereof up to the upper side ofy the machine, from gio IOO

which it is again delivered to the hoppers 92 and 93 to be again fed tothe grinding-rolls, as before described.

. It will be observed that although two sets ofgrinding-rolls' are heldby springs against the grinding-rings the grinding-rings lare supportedby the upper set of rolls, which arev carried on ashaf-t which has nomovement other than the necessary rotary motion impartedby thedriving-pulleys 9 and 10. The

-ual reduction hereinbefore described vried by said shafts coactinorsets of grinding-rolls and obtaining the radobtain vastly differentresults than are obtained by said patented mill.

It is obvious that modifications and variations may be made in the formof my invention without departi' g' from the essentialfeatures thereof,and I therefore refer to the following claims to point out the scope ofmy invention, and in some of these claims I have referred to a series orplurality of rolls on the 'main or driving shaft. It will be obviousthat these rolls may be formed in one integral piece and keyed to theshaft and yet be a se.- ries so far as their shape and driving effect isconcerned. I therefore intend the claims to cover" the three rolls onthe driving-shaft Whether said rolls are integral or separate.

What I claim as myinvention is I. In a pulverizing-mll, a series ofindependent revolving rino's, in combination with a series of rollslocated within and imparting tion is attained, substantially asdescribed. 2. The combination in a pulverizing-rnil-l,

of a series of independent revolving rings, .a

series of rolls located within and imparting rotary movement to saidrings, and a series of spring-'mounted grindingrollsalso coacting withsaid rings, the rolls being of different sizes whereby a adual reductionis ate tained, substantial y as described.

3. The combination in a pulverizing-mill, of a series of independentgrinding-rings, a main shaft, a series of rolls of differentsize on saidshaft, said rolls supported within and impartingfrotarymovement to saidrings,

supplemental shafts, spring-mounted bearings for said shafts, andgrindin -rolls car,-

with t e series -of grinding-rings, the rolls being of different sizeswhereby a gradual .reduction is 'attained substantially as described.

4. The combination in a pulveri'zing-mill, of a seriesfof grindinrings`, a main shaft, a series of rolls on sai shaft, saidrollssupported within and imparting `rotary movement to said rings,'supplemental shafts, spring-mounted bearings for said shafts,

A grindmg-rollsncarried by said shafts coacting with the series ofgrinding-rings, and means described. 5.` The combination in apulverizing-mill, of a series ofgrindin -rings, a main shaft, a seriesof rolls .on .sai

ment to said rings, supplemental shafts,

grinding-rolls carried by lsaid shaftsv coaeting with the series ofgrinding-rings, and `plates shaft, said rolls supported withln. andimparting rotary move from passing out of the outer sides of the outsiderings, substantiallyT as described.

6. The combination in a pulverizing-mill, of a driving-shaft., agrinding-ring, a roll carried by said shaft and imparting rotarymovement directly to said ring, supplemental shafts, a grinding-rollsupported on each of said shafts coactmg with said rin to grindmaterialbetween said rolls and sai ring, and a frame having openingswithin which the bearings of said shafts are located, and spring-mounteddevices also located within the openings in said frame ,for forcing thelast-mentioned rolls against said ring, substantially as described.

7. rIhe combination in avpulverizing-inill, of a driving-shaft, a seriesof inde endent rindinU-rin s a series of rolls carrie( b saidsaidfr'ings and a frame having openings in rotary movement to saidrings, the rolls being of different sizes whereby a gradual reducringsand a frame having openings in which' the bearings of said shafts aresituated, and

means for preventing the material from passing out of the outer sidesofsaid rings, substantially as described.

9. The combination in a pulverizing-mill, of a driving-shaft, a seriesof independent grinding-rings, a series o f rolls carried by said shaftandimparting'rotary movement to said rings, supplemental shafts, aseries of rolls supported on each of said .shafts coacting Wit saidrings and a frame having openings in which the bearings of said shaftsare situated, and springfactuated devices for said bearin to force thelast-mentioned rolls against said rings, vsubstantiallyas described.

10. VThe comb ation in a pnlverizing-mill, of a driving-shaft, a seriesof inde endent grinding-rings, a series of rolls carrie by said shaft.and imparting rotary movement to said rings, supplemental shafts, aseries of rolls 4supported on each of said shafts coacting ated, andspring-mounted devices b also located Within the openings in said framesfor forcing the last-mentioned series of rolls IDO ICS

l IIO a'gainst said rings, substantially as described. l

11. The combinationin a ulverizing-mill,

of a grinding-ring, a roll wit in and impart- 1 ing rotary movementdirectly to said ring, a main frame having recesses therein formed at anangle toeach other, bearings movablyorrings for preventing thecrushedfmaterial i-held in each recess, shafts supported by-said l 12.The combination 1n a pulveriZing-.Inill,l

of a series o f independent grinding-rings,V a series of rolls 'WithinYand imparting rotary movement to said rings, a main frame havingrecesses therein formed at an angle to each other, bearings movablyheldin each recess, shafts supported by saidv bearings, each shaft lhaving a series of rolls vcoactir'ig with the said series of rings, andmeans for holding the lastmentioned seriesof rolls in grindi contactwithsaid series of rings, substantia ly as described.

18. The combination in a pulverizing-mill, of a series of independentgrinding-rings, a seriesof rolls within andimparting rotary movement tosaid rings, a main frame having recessestherein'formed at an angle toeach other, bearings movably held in each recess, shafts supported bysaid .bearings each 'shaft having a series of rolls coacting withtlesaid series of rin s, and spring-mounted means for holding t elast-mentioned series of rolls in grinding contact with the said seriesof rings, substantially as described.

14. The combination in a pulverizing-mill, of a series of independentgrinding-rings, la series of rolls within and imparting rotary movementto said rings, a main frame formed in two parts lceated on oppositesides of said grinding rolls and rings, said frame havingl recessestherein, bearings movably mounted -Within said recesses, shafts in saidbearings,

and grinding-rolls on each of said shafts Within the aforesaidgrinding-rings, and means for causing material to escape through theseries of openings, 'substantially as described. K

15. The combination in a pulverizing-mill,

l of a series of independent grinding-rings, a

series of rolls within and imparting rotary movement to said rings, amain frame formed in two parts located on opposite sides of ,saidIgrinding rolls and rings, said frame having recesses therein,spring-mounted bearingsmovably mounted Within said recesses, shafts insaid bearings, and grinding-rolls on each of said shafts within theaforesaid grinding-rings, substantially'as described.

of a rotatable grinding-ring', a roll surrounded by saidA ring andimparting rotary movement thereto, a' grindingfroll, land a rotary`sieve rotatable around said roll and rin and having means for returningthe unsifte material to said roll and ring to 'be reground,

' sieve notata 16. Ina pulverizing-mill, the combination grinding-roll,a hopper 'feeding material to said'ring and roll and a rotary sieverotatable .around said ring and roll and having means forreturning theunsifted material to said ",hopper to be a ain delivered to saidgrinding ring and rol substantially as described.

18. In a plilverizing-milhthe combination of a grinding-ring, a rollwithin and imp artin motion to said grinding-ring, grindingro ls alsosupported within said ring and held in grinding contact therewith, an arotary sieve rotatable around said rolls and ring and having means forreturning the unsifted material to said rolls and ring, substantially asdescribed. y

19. In a pulverizing-mill, the combination of a series ofgrinding-rings, a series of rolls within and im -artin' motion to saidgrinding-rings, grin in -frollls also sup orted Within "saidnrings an-held in grinding contact therewith, and -a 'rotary sieverotatablearound said rolls and rings and having means for returning the uns'iftedmaterial to said rolls and rings, substantially as described.

20. In a pulverizing-'milL the combination of a grinding-ring, a rollWithin and impartvi motion to said grinding-ring, grindingrol s also suported within said rin and held in grinding contact therewith, an arotary'sieve rotatable around said rolls-and ring and having pockets forreturning the unsifted material to said rolls and ring, sub!-stantiallyas described.

21. In a pulverizlng-mill, I'the combination vof a grinding-ring, a rollWithin and im artmotion to 4said grinding-ring, grin ing Y ported withinsaid rm r,.a rotary mgl ro s also su e around said rolls and ring andprovided with meansdor returning the unsifted material tosaid -rollsand'ring, said sieve having an internal gear, anda gear lV meshing withs'aid internal gear for rotating the sieve, substantially as described'.

22. In a pulverizing-mill, the combination of a grinding-ring, a rollWithin andim art- IIO ing -motion tosaid grinding-ring, a 'sha t forimparting motion to `said roll, a rotary sieve rotatable around saidroll and rin and hav-` ing means for returning the unsi ted materialthereto, and gearing driven by said shaft for rotatin said rotary sieve,substantially as describe f Y 23. In a pulverizing-mill, the combinationof a grinding-ruig, a roll Within and impart-v ing movement to saidring, a hoplper feeding material between said roll and ring, and. arotary sieve rotatable around said roll and rin and' having means forreturning the unsite material to said hopper, substantially asdescribed. n y

24. In a pulverizing-mill, the combination ofa'grinding-ring, a rollwithin said ring, a hopper on'each side of said roll and ring to feedmateriali thereto, and a rotary sieve roscribed.

-tatable around said roll and ring and having I means across the sieveat the outside margin thereof for returning the unsifted material to isaid hoppers, substantially as described. l 25. ln-apulverizing-mill,thecombination r of a grinding-ring," airoll within said ring, a hopperon eachside of said roll andring to feed material:l thereto, and arotary's'ieve rol tatable around said roll and ring and having pocketsacross the sieve at the outside margin thereof orlreturrn'ng the unsitedmaterial to SaidJ-Zh'OpperS, substantially as de- 26. The combination ina pulveriZing-mill, of a series of revolving rings, a series of rollslocated Within and imparting rotary movement tosaid rings, a series ofspring-mounted `grinding-rolls also coacting with said rings, l andmeans for preventing the crushed niaterial'from passing out of the outersides of the outside rings, substantially as described.

27. `The combinationina pulverizing-mill, of a series of revolvingrings,a seriesof. rolls locatedwithin and imparting rotary movement to saidrings,a series of spring-mounted grinding-rolls also coacting with saidrings, and rings or plates for preventing the crushed material frompassing out of the outer sides ofthe outside rings, substantially asdescrill ed.

28. A'pulverizing-m-ill', having, in combination, a plurality ofindependent grindingrings located side by side and having internal`grinding-surfaces',, andgrinding elements' col operating therewith, oneof the rings being located with its grinding-surface lower at its lowerportion than the grinding-surface of the adjacent ring so as to receivematerial from the adjacent ring for regrinding, substantially asdescribed. i'

29. A vpulverizing-n ill, having, in combination, a 1plurality ofindependent rotating grinning rlngs having concentric internalgrinding-surfaces, means for rotating the rings, and grinding elementscooperating therewith, the internal diameter of one' ring being greaterthan that of an adjacent ring so that the former ring may receivematerial lfrom the latter ring ior regrinding, substantially asdescribed. Y

80. A pulverizing-mill, having, in combination, a plurality ofindependent'c'oncentric grinding-rings of diflerent internal diameterslocated side by side, and a plurality of rollsV engaging the interiorlsurfaces of the rings, v

the rolls being of different diameters and being arranged to rotateconc'entrically, substantiallj)T :is desoriL ed. l

31. A pulverizing-mill, having, in combination, a plurality of rotatingrings, located side by side with an escape-opening between for.puiverized material, and means for rotating the rings with diiferentperipheral velocities so that the lateral-surfaces of the rings' have adiiierential motion facilitating the passage of 'materialtherebetween,substanti-ally as described. f

Signed by me at Columbia, thisv9th day of September, 1904. WILLIAM S.OSBORNE.'

Witnesses:

THEO. E. ROBERTSON,

G. M.- BOND.

Washington, District of i lio

